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When power is initially applied to the zero speed switch, the alarm relay is energized and held by the timing circuit for desired (settable) time duration. Whenever the motion detector sensor detects a target, a signal in the form of pulse re-triggers an internal timing circuit. This action keeps the alarm relay energized providing a fail-safe operation of the contacts. If no target is sensed for desired time duration (that is settable), the timing circuit will not be re-triggered. This will cause the alarm relay to de-energies and the contacts to change state. Thus the relay output contact can be used for signaling / controlling.

Mechanical Specifications

Electrical Specifications

Cable Entries

2 nos.

Operating Temperature

-20°C to +60°C


Cast aluminium, weatherproof Stoving enamel painted


By potential-free N.O. contact of contactor controlling the motor of the monitored equipment

Start-up Time Delay

3 sec to 20 sec

Zero Speed Time

3 ppm to 20 ppm


110 / 230 V AC (-10 to +10%) 50 Hz (as specified in the order)

Power Consumption



One relay with a set of potential-free c.o. contact rated at 6A, 230 V AC, 50Hz for non-inductive load

Applications Specifications

Zero speed switch is suitable for detecting the absence or presence of motion of rotating, reciprocating or conveying equipment.

Switching Indication

2 LED’s

Red: Alarm (relay de-energized), Green: Normal (relay energized), Yellow: Pulse Detection